Honestly you need to see a dr asap. This is probably due to hormonal issues (hopefully easily treated), but it could be serious. Make sure to talk to your doctor about any sensations in the breast tissues such as pulling, burning- and your itching. Also tell your doctor about any other changes- appetite, weight, discharge, periods OR things like headaches, dizziness, fatigue, lethargy, etc. because these could be related.
Don't be shocked if your dr orders an ultrasound. Many doctors will do this if they have any reason to think that something is the least bit suspicious. Fair warning an ultrasound on your breast hurts a bit and is kind of awkward. Also don't be surprised if they don't ask for a mammogram. These are really made invalid by the dense breast tissue in young women and it's very difficult to see a mammogram clearly if a woman is under a certain age.